當在hdfs中調用hdfsOpenFile時，Hadoop異常java.lang.NoSuchMethodError C API

首先，我使用正確設置的mvn和環境變量構建了hadoop-2.7.2。然後我試圖在Apache網站運行簡單的例子：C API libhdfs example code 當在hdfs中調用hdfsOpenFile時，Hadoop異常java.lang.NoSuchMethodError C API

#include "hdfs.h" 

int main(int argc, char **argv) { 

    hdfsFS fs = hdfsConnect("default", 0); 
    const char* writePath = "/tmp/testfile.txt"; 
    hdfsFile writeFile = hdfsOpenFile(fs, writePath, O_WRONLY |O_CREAT, 0, 0, 0); 
    if(!writeFile) { 
     fprintf(stderr, "Failed to open %s for writing!\n", writePath); 
     exit(-1); 
    } 
    char* buffer = "Hello, World!"; 
    tSize num_written_bytes = hdfsWrite(fs, writeFile, (void*)buffer, strlen(buffer)+1); 
    if (hdfsFlush(fs, writeFile)) { 
     fprintf(stderr, "Failed to 'flush' %s\n", writePath); 
     exit(-1); 
    } 
    hdfsCloseFile(fs, writeFile); 
}

然後我得到了如下錯誤信息：

$ could not find method create from class org/apache/hadoop/fs/FileSystem with signature (Lorg/apache/hadoop/fs/Path;Lorg/apache/hadoop/fs/permission/FsPermission;ZISJILorg/apache/hadoop/util/Progressable;Z)Lorg/apache/hadoop/fs/FSDataOutputStream;

$ Exception in thread "main" java.lang.NoSuchMethodError: create

$ Call to org.apache.hadoop.conf.FileSystem::create((Lorg/apache/hadoop/fs/Path;Lorg/apache/hadoop/fs/permission/FsPermission;ZISJILorg/apache/hadoop/util/Progressable;Z)Lorg/apache/hadoop/fs/FSDataOutputStream;) failed!

但我可以在組織找到「創建」功能.apache.hadoop.fs.FileSystem： org.apache.hadoop.fs.FileSystem function list

任何人都知道發生了什麼？

來源

2016-08-12 Bartholomew Kuma

我不得不承認我這個愚蠢的問題。我在鏈接定義中包含錯誤的依賴項。所以我的程序試圖從另一個庫調用錯誤的create（）... 現在我可以使用所有開源的hdfs API了。

來源

2016-08-26 07:16:02

當在hdfs中調用hdfsOpenFile時，Hadoop異常java.lang.NoSuchMethodError C API

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